利用生物膜反应器处理工厂化循环水海水养殖尾水研究  

Study on the treatment of industrial recirculating water mariculture tail water by biofilm reactor

作　　者：杨舒涵 徐光景 刘琦 肖景霓 郑丽娜 YANG Shu-han;XU Guang-jing;LIU Qi;XIAO Jing-ni;ZHENG Li-na(College of Marine Technology and Environment,Dalian Ocean University,Dalian 116023,China;Key Laboratory of Nearshore Marine Environmental Science and Technology in Liaoning Province,Dalian Ocean University,Dalian 116023,China)

机构地区：[1]大连海洋大学海洋科技与环境学院,辽宁大连116023 [2]辽宁省近岸海洋环境科学与技术重点实验室,辽宁大连116023

出　　处：《环境生态学》2022年第7期101-104,共4页Environmental Ecology

基　　金：辽宁省科技重大专项计划“辽宁重要海水鱼类高效绿色生产模式研发与示范”项目(2020JH1/10200002)资助。

摘　　要：工厂化循环水海水养殖最大化实现了水资源循环利用,但其尾水积累了较高浓度的硝酸氮,对近岸受纳水体产生了较大影响。实验构建固定床生物膜反应器,用以研究海水养殖尾水的反硝化深度脱氮。结果表明,在COD/N为5∶1时,不但反硝化不彻底,还会导致亚硝酸氮积累,产生二次污染;循环水海水养殖尾水深度脱氮所需COD/N高达6∶1以上,究其主要原因尾水中高溶解氧消耗大量有机碳,使得碳源投加量加大;碳源投加过剩则导致碳源浪费,也会对海水造成二次污染。因此,COD/N对RAS海水养殖尾水处理至关重要,需要合理控制。Industrial recirculating water mariculture maximizes the recycling of water resources,but its tail water accumulates high concentration of nitrate,which has a great influence on the nearshore receiving water body.A fixed-bed biofilm bioreactor was constructed to study the deep denitrification of mariculture tail water.Results showed that nitrate residual and nitrite accumulation was found with a COD/N ratio of 5∶1,resulting in a secondary pollution.The main reason is that the high dissolved oxygen in the tail water consumed some organic carbons,which increased the external carbon source dosage.In fact,the COD/N required for deep nitrogen removal of recirculating mariculture was about 6∶1,otherwise it led to a waste of external carbon sources and secondary pollution to seawater.Therefore,COD/N is very important for tail water treatment of recirculating water mariculture and needs reasonable controls.

关 键 词：反硝化 碳氮比 硝酸氮 水力停留时间 

分 类 号：X714[环境科学与工程—环境工程]